frequency shift

简明释义

频移

英英释义

例句

1.The scientist measured the frequency shift of light emitted from the moving star.

科学家测量了从移动恒星发出的光的频率偏移。

2.A frequency shift in sound waves can indicate changes in pitch.

声音波中的频率偏移可以表示音高的变化。

3.In telecommunications, a frequency shift can affect signal clarity and quality.

在电信中，频率偏移会影响信号的清晰度和质量。

4.The radio experienced a frequency shift due to interference from nearby electronics.

由于附近电子设备的干扰，收音机经历了一个频率偏移。

5.During the experiment, we observed a noticeable frequency shift in the microwave signal.

在实验过程中，我们观察到微波信号中明显的频率偏移。

作文

In the realm of physics and engineering, the concept of frequency shift plays a pivotal role in understanding various phenomena, particularly in the fields of acoustics and electromagnetism. To grasp the significance of frequency shift, one must first comprehend what frequency is. Frequency refers to the number of occurrences of a repeating event per unit time, typically measured in hertz (Hz). When we talk about frequency shift, we are essentially discussing the change in frequency of a wave or signal as it travels through different mediums or interacts with moving objects.One of the most common examples of frequency shift can be found in the Doppler effect, which describes how the frequency of a wave changes for an observer moving relative to the source of the wave. For instance, when an ambulance with a siren approaches, the sound waves are compressed, resulting in a higher frequency, or pitch, that we hear. As the ambulance passes and moves away, the sound waves are stretched, leading to a lower frequency. This observable phenomenon is a direct illustration of frequency shift in action.Furthermore, frequency shift is not limited to sound waves; it is also applicable to electromagnetic waves, such as light. The redshift and blueshift observed in astronomy are perfect examples of frequency shift. When a star or galaxy is moving away from Earth, the light it emits shifts toward the red end of the spectrum, indicating a lower frequency. Conversely, if it is moving closer, the light shifts toward the blue end, indicating a higher frequency. This principle has profound implications for our understanding of the universe, including the expansion of the cosmos and the behavior of celestial bodies.In telecommunications, frequency shift is utilized in various technologies, including frequency modulation (FM) and phase-shift keying (PSK). These techniques rely on altering the frequency of a carrier wave to convey information. By manipulating the frequency shift, engineers can transmit data over long distances with minimal interference, ensuring clear communication.Moreover, frequency shift has applications in medical imaging, particularly in ultrasound technology. When sound waves are emitted into the body, they bounce off tissues and organs, creating echoes. The frequency of these echoes can shift based on the movement of blood or other fluids within the body. By analyzing the frequency shift of these echoes, medical professionals can gain valuable insights into a patient’s health, including blood flow and organ function.In conclusion, the concept of frequency shift is integral to many scientific and technological advancements. From understanding the Doppler effect in everyday life to its applications in astronomy, telecommunications, and medicine, frequency shift provides a framework for interpreting how waves interact with their environments. As we continue to explore the intricacies of the universe and develop new technologies, the importance of mastering the concept of frequency shift cannot be overstated. It serves as a reminder of the interconnectedness of various fields of study and the profound impact that a single concept can have across diverse disciplines.

在物理学和工程学领域，频率偏移的概念在理解各种现象中扮演着关键角色，特别是在声学和电磁学领域。要理解频率偏移的重要性，首先必须理解频率是什么。频率是指每单位时间内重复事件发生的次数，通常以赫兹（Hz）为单位。当我们谈论频率偏移时，我们实际上是在讨论波或信号在不同介质中传播或与移动物体相互作用时频率的变化。最常见的频率偏移示例可以在多普勒效应中找到，该效应描述了当观察者相对于波源移动时，波的频率如何变化。例如，当一辆带有警报器的救护车接近时，声波被压缩，导致我们听到的频率或音调增高。当救护车经过并远离时，声波被拉伸，导致频率降低。这种可观察的现象是频率偏移作用的直接说明。此外，频率偏移不仅限于声波；它也适用于电磁波，例如光。在天文学中观察到的红移和蓝移就是频率偏移的完美例子。当一颗星星或星系远离地球时，它发出的光向光谱的红端偏移，表示频率降低。相反，如果它靠近，光就会向蓝端偏移，表示频率升高。这个原理对我们理解宇宙有深远的影响，包括宇宙的扩张和天体的行为。在电信中，频率偏移被应用于各种技术，包括频率调制（FM）和相位偏移键控（PSK）。这些技术依赖于改变载波波的频率来传递信息。通过操纵频率偏移，工程师可以在长距离上传输数据，尽量减少干扰，确保清晰的通信。此外，频率偏移在医学成像中也有应用，特别是在超声技术中。当声波发射到体内时，它们会反弹到组织和器官，产生回声。这些回声的频率可能会因血液或其他液体在体内的运动而发生偏移。通过分析这些回声的频率偏移，医疗专业人员可以获得有关患者健康的宝贵见解，包括血流和器官功能。总之，频率偏移的概念对于许多科学和技术进步至关重要。从理解日常生活中的多普勒效应到其在天文学、电信和医学中的应用，频率偏移提供了一个框架，用于解释波如何与其环境相互作用。随着我们继续探索宇宙的复杂性并开发新技术，掌握频率偏移这一概念的重要性不容忽视。它提醒我们各个研究领域之间的相互联系，以及单一概念在不同学科中可能产生的深远影响。